So I just spent more time on this than I probably should have…
But based on his strava file he did about 4 1/3 laps of that triangle as his 5k effort. When I plotted it out on RWGPS that came out to about 3 mi (so basically a 5k). But if you look at this screen shot of the course the GPS track is fixed on the road (the outside of the triangle) while you can see a sidewalk and driveway on the inside of the triangle. I bet he ran around the inside but the garmin GPS was fixed on the road so it inflated his distance. By how much? I don’t care enough to figure out but it could easily be 10% so about 500m or about an extra minute of running time for a 5k.
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